<template>
  <div :class="className" :style="{height:height,width:width}"/>
</template>

<script>
    import echarts from 'echarts'

    require('echarts/theme/macarons') // echarts theme
    import {debounce} from '@/utils'

    export default {
        props: {
            className: {
                type: String,
                default: 'chart'
            },
            width: {
                type: String,
                default: '100%'
            },
            height: {
                type: String,
                default: '300px'
            }
        },
        data() {
            return {
                chart: null
            }
        },
        mounted() {
            this.initChart()
            this.__resizeHandler = debounce(() => {
                if (this.chart) {
                    this.chart.resize()
                }
            }, 100)
            window.addEventListener('resize', this.__resizeHandler)
        },
        beforeDestroy() {
            if (!this.chart) {
                return
            }
            window.removeEventListener('resize', this.__resizeHandler)
            this.chart.dispose()
            this.chart = null
        },
        methods: {
            initChart() {
                this.chart = echarts.init(this.$el, 'macarons')

                this.chart.setOption({
                    series: {
                        type: 'sankey',
                        layout: 'none',
                        focusNodeAdjacency: 'allEdges',
                        data: [{
                            name: 'a'
                        }, {
                            name: 'b'
                        }, {
                            name: 'a1'
                        }, {
                            name: 'a2'
                        }, {
                            name: 'b1'
                        }, {
                            name: 'c'
                        }],
                        links: [{
                            source: 'a',
                            target: 'a1',
                            value: 5
                        }, {
                            source: 'a',
                            target: 'a2',
                            value: 3
                        }, {
                            source: 'b',
                            target: 'b1',
                            value: 8
                        }, {
                            source: 'a',
                            target: 'b1',
                            value: 3
                        }, {
                            source: 'b1',
                            target: 'a1',
                            value: 1
                        }, {
                            source: 'b1',
                            target: 'c',
                            value: 2
                        }]
                    }
                })
            }
        }
    }
</script>
